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III.—On the Occurrence of the Genus Endoceras in Britain

Published online by Cambridge University Press:  01 May 2009

H. Alleyne Nicholson
H. Alleyne Nicholson
Affiliation:
Professor of Natural History and Botany in University College, Toronto
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Extract

The genus Endoceras was proposed by Hall (Pal. N. York, vol. i., p. 58) for a group of Orihocerata; having “a large siphunele, mostly lateral or excentric, marked or ridged on the outer surface by the septa, which, from their oblique direction, give it the appearance of a tube with spiral lines. Within this siphunele are one or more very elongated eonical tubes, often one within the other to the number of four or five.” The leading point, then, in the definition of Endoceras is the possession of a multiple siphunele, composed of two or more concentric tubes placed one within the other, each tube having the form of an elongated cone.

Type
Original Articles
Information
Geological Magazine , Volume 9 , Issue 93 , March 1872 , pp. 102 - 104
Copyright
Copyright © Cambridge University Press 1872

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